A lot of people feel that needing glasses disqualifies one from joining the military, so I looked it up and found the following:
DoD regs said:a. Distant visual acuity of any degree that does not correct with spectacle lenses to at least one of the following (367):
(1) 20/40 in one eye and 20/70 in the other eye.
(2) 20/30 in one eye and 20/100 in the other eye.
(3) 20/20 in one eye and 20/400 in the other eye. However, for entrance into a military academy, distant visual acuity that does not correct to 20/20 in each eye is disqualifying. For entrance into ROTC programs and OCS/OTS, distant visual acuity that does not correct to 20/20 in one eye and 20/100 in the other eye is disqualifying.
b. Near visual acuity (367) of any degree that does not correct to 20/40 in the better eye.
c. Refractive error (hyperopia (367.0), myopia (367.1), astigmatism (367.2)), in any spherical equivalent of worse than 8.00 or + 8.00 diopters; if ordinary spectacles cause discomfort by reason of ghost images or prismatic displacement; or if corrected by orthokeratology or keratorefractive surgery. However, for entrance into a military academy or ROTC programs, the following conditions are disqualifying:
(1) Astigmatism, all types over 3 diopters.
(2) Hyperopia over 8.00 diopters spherical equivalent.
(3) Myopia over 6.75 diopters spherical equivalent.
(4) Refractive error corrected by orthokeratology or keratorefractive surgery.
d. Contact lenses. Complicated cases requiring contact lenses for adequate correction of vision, such as corneal scars (371) and irregular astigmatism (367.2).
e. Color vision (368.5). Although there is no standard, color vision will be tested because adequate color vision is a prerequisite for entry into many military specialties. However, for entrance into a military academy or ROTC or OCS/OTS programs, the inability to distinguish and identify without confusion the color of an object, substance, material, or light that is uniformly colored a vivid red or vivid green is disqualifying.
Derived from Department of Defense (DOD) Directive 6130.3, Physical Standards for Appointment, Enlistment, and Induction, and DOD Instruction 6130.4, Criteria and Procedure Requirements for Physical Standards for Appointment, Enlistment, or Induction in the Armed Forces.